The effect of magnetic field configuration on the performance of minimum-B ECR ion source

Main funder

Funder's project number: 315855

Funds granted by main funder (€)

468 468,00

Funding program

Academy Project, AoF (Academy of Finland)

Project timetable

Project start date: 01/09/2018

Project end date: 31/08/2022


The performance of Electron Cyclotron Resonance Ion Sources (ECRIS), producing high charge state ions from a great variety of elements, has improved dramatically over the past decades, thus enabling significant advances in accelerator-based nuclear physics and applications. Further advances in nuclear physics research and applications require constant development of the ion source technology in terms of variety and intensity of available ion beams. The design of modern ECR ion sources is based on semi-empirical scaling laws, suggesting most importantly that the extracted current at the peak of the ion charge state distribution scales with the applied microwave frequency squared. Fulfilling the magnetic field scaling laws sets a practical limit for conventional ECRIS development relying on room-temperature (RT) technology. Increasing the frequency beyond 56 GHz requires either accepting a substandard field strength or R&D on innovative ECRIS concepts, e.g. the ARC-ECRIS feasible up to 100 GHz.

The proposed study consists of three complimentary approaches to study the effect of the magnetic field topology on ECR ion source performance and its stability. We plan to commission a prototype ECR ion source with a magnetic field configuration similar to that of the proposed ARC-ECRIS concept -- and to demonstrate its feasibility for high charge state ion beam production. We propose to utilize a rectangular slit extraction instead of the conventional round aperture. The choice is driven by the desire to optimize the geometrical overlap of the extraction system with the pattern of plasma losses. We propose to study the role of the magnetic field strength and gradient on the appearance and nature of the kinetic instabilities inherent to ECRIS plasmas. Both, conventional (solenoid + sextupole) and new innovative prototype would be utilized for this subtask. The project has a wide international aspect and impact. As an example, the thesis work described in the application is a joint research (cotutelle) between University of Jyväskylä (Finland) and University of Grenoble Alpes (France). The research project paves the way for next generation ECR ion sources and carries significant potential for a major breakthrough in ion source physics and technology.

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Last updated on 2019-18-12 at 10:44